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Cartridges having interiorly positioned zones of reduced thickness

  • US 5,656,311 A
  • Filed: 04/25/1995
  • Issued: 08/12/1997
  • Est. Priority Date: 07/05/1991
  • Status: Expired due to Term
First Claim
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1. A cartridge container containing a substance for preparation of a beverage comprising:

  • a body comprising a base, a sidewall and a rim, wherein the sidewall extends from the base to define a container interior, to define a container opening which opposes the base and to define a body shape selected from the group consisting of a frustum and a hemisphere and wherein the sidewall extends from the base to the rim and the rim extends from the sidewall in a direction away from the sidewall;

    a cover membrane member affixed to the rim to cover the opening;

    a substance for preparation of a beverage contained within the container interior by the body and cover membrane member; and

    wherein the base defines both a container base outer solid surface and a container base interior surface and wherein the container base contains a plurality of perforations which define openings in the base which extend for a distance from the container base interior surface through the base towards the container base outer solid surface to provide localized absence of a plurality of portions of the base so that the base has a plurality of zones which comprise a plurality of localized portions of reduced thickness and so that when a fluid pressure for extraction of the substance for preparation of a beverage is applied, the localized portions of reduced thickness tear and open for beverage passage.

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